采用拉伸试验，研究了不同应变速率（10-5－10-1s-1）下温度对具有近全片层组织的γ＋α2双相Tial合金的屈服强度和延伸率的影响，得到Tial合金韧脆转变温度随应变速率升高而升高的变化关系，随后确定Tial合金韧脆转变激活能为324kJ／mol．这一激活能数值与Tial合金中原子自扩散激活能相当.结合断口分析和理论计算结果，认为Tial合金韧脆转变过程可能受位错攀移机制控制.
The effect of strain rate is studied on the tensile yield strength and elongation of γtitanium aluminide with a near lamellar microstructure. It is found that γ titanium aluminide manifests brittle-to-ductile transition (BDT) at elevated temperature and the brit-tle-to-ductile transition temperature (TBDT) is positively sensitive to the strain rate. The activation energy of BDT has been determined to be 324 kJ / mol, which is approximately the same as the self-diffusion activation energy of atoms in the Tial alloy. From the approximation, and the additional fractography analysis and theoretical calculation, it is concluded that the course of γtitanium aluminide is controlled by dislocation climbing.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%